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| The backbone cabling shall use the hierarchical star topology where each horizontal cross-connect in a telecommunications room is cabled either directly to a main cross-connect or through an intermediate cross-connect to a main cross-connect. This topology offers flexibility to support a variety of applications. Requirements There shall be no more than two hierarchical levels of cross-connects in the backbone cabling. From the horizontal cross-connect, no more than one cross-connect shall be passed through to reach the main cross-connect. Therefore, connections between any two horizontal cross-connects shall pass through three or fewer cross-connect facilities. Bridged taps shall not be used as part of the backbone cabling. Recommendations Backbone cabling cross-connects may be located in telecommunications rooms, equipment rooms, or at entrance facilities. NOTES: The limitation of two levels of cross-connects is imposed to limit signal degradation for passive systems and to simplify moves, adds and changes. This may not be suitable for facilities that have a large number of buildings or that cover a large geographical area. In these cases, it may be necessary to divide the entire facility into smaller areas and then connect these areas together.
Backbone hierarchical star topology :: | 6/55